At the moment - and this can, and probably will, change in a few minutes ... I'll vote for Alfred Cheney Johnston (1885-1971). Flo Ziegfield hired him as the official photographer of his show dancers, the Ziegfield girls. Breathtaking photographs of women.
"Johnston perfected a wonderfully titillating skill of making his dressed women look nude."
from: 20th Century Photography - Museum Ludwig Cologne.